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I know that to play online I need a unique cd key and create an account with them. Does that mean I can not buy a used copy then or else I can't play online (abit like steam i suppose)?

Does this happen with all of their games? Even the old ones or just the new ones?

I ask this cos I want to get battlefield but I don't know if getting a used copy will work or not.
BTW is it worth getting the old battlefields like 1942 and vietnam? Will they work online used?
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